2231521661264 has 80 divisors (see below), whose sum is σ = 5036689202688. Its totient is φ = 937905785856.

The previous prime is 2231521661251. The next prime is 2231521661357. The reversal of 2231521661264 is 4621661251322.

It is a super-3 number, since 3×2231521661264³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13493444 + ... + 13657820.

Almost surely, 2^{2231521661264} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2231521661264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2518344601344).

2231521661264 is an abundant number, since it is smaller than the sum of its proper divisors (2805167541424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2231521661264 is a wasteful number, since it uses less digits than its factorization.

2231521661264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166732 (or 166726 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The spelling of 2231521661264 in words is "two trillion, two hundred thirty-one billion, five hundred twenty-one million, six hundred sixty-one thousand, two hundred sixty-four".